Limit power of exciter

[radium98]

Oh many thanks .

[LeeCavanagh]

Albert, what would i need to limit 100mw down to between 1mw and 30mw. ? Do i need a 60db attenuator?

[Albert H]

The power P(dBm) in dBm is equal to 10 times the base 10 logarithm of the power P(mW) in milliwatts (mW) divided by 1 milliwatt (mW):

P(dBm) = 10 ⋅ log10( P(mW) / 1mW)

So,

1mW = 0dBm

100mW = 20 dBm

30mW = 14.77dBm

.....so you need a ~5.2dB @ 50Ω pad.

Your power reducer has to be made with carbon (non-inductive) or surface-mounted resistors so there's no inductance mucking up your results.

Three different pad options

Pad.jpg

If you go for the first option, you could use two 15Ω and one 82Ω resistors for a reasonably accurate result.

[LeeCavanagh]

Thanks Albert